Manufacture of colored photographic pictures



Filed `June 18, 1936 John .E rgert BrunoF/endt In venfors J. EGGERT ET AL 2,153,617

Patented Apr. 11, 1939 PATENTV ol-FICE MANUFACTURE OF COLORED PHOTO- GRAPHIC PICTURES John Eggert, Leipzig-Gohlis, and Bruno Wendt,

Dessau,

Germany, assignors, by mesne assignments, to Agfa Ansco Corporation, Binghamton, N. Y., a corporation of New York Application June 18,1936, Serial No. 85,840

In Germany June 22, 1935 Our present invention relates tothe manufacture of colored photographic pictures. One of its objects is'to provide a process for producing improved colored photographic pictures. Another object is the-provision of a material on which the improved pictures are produced. Further objects will be seen from the detailed speciiication following hereinafter. l The single figure of the accompanying drawing shows a film for use in accordance with the invention.

The manufacture and application of colored iilter layers which contain dyestuils stable to the developing and xing baths is known.

The use oi such colored layers in a multi-layer material produces pictures in natural colors only with great difllculty when the known methods are applied. For producing colored cinematograph films the process fails.

According to this invention we have found a process which can be easily operated, even mechanically, for producing 3color pictures, whereirnthe intermediate filter layers which are 4 incapable of being'removed by developing and 25 cording to the arrangement of the photographic layers one or two of the part-pictures have been converted into a` colored picture, that is to say, when the iilter layers are used not only for color separation-in the exposure or copying operation (nrst exposure) but also for the purpose of converting the developed and nxedl silver picture, converted into silver halide, into a colored pic- 'ture for the single exposure (secondexposure) of the silver halide part-picture.

The process may be as follows:

A tri-pack material ready for exposure is made vup in the following order:

1=blue sensitive layer 2=yellow lter 3=green sensitive layer 4=red filter 5=red sensitive layer.

usual methods. The yellow lter may, for example, .be a gelatin layer which contains Fuller's yellow? (Schultz Farbstoitabellen, 7th edition,

Vol. I, No. 230 Vol.-II, page 227) made insoluble j by calcium nitrate, while the red iilterlayer may contain the aluminium lake of the dyestuii from diazotized naphthylamine and 2-hydroxy-naph--- thalene3.6disulfonic acid.

After the exposure the materialv is developed 55 andflxed in the usual manner whereupon the ilxing baths are retained unchanged untiLac- The emulsions and iilter layers are made by the silver pictures in the layers 1, 3 and 5 are converted into silver halide in known manner. c

Now the layer 1 is exposed to blue light, whereby the light penetrating into the layer 2 will be completely absorbed, and is developed with a 5 developer which yields a yellow picture, for exampie, a developer consisting of a solution of 5 grams of yl-p'chlorphenyl-3-methyl-4-aminopyrazolone, 5 grams of dry sodium sulte and 0.5 gram of potassium bromide in 1000 cc. of water. 10 Then layer 5 is exposed from the back of the -iilm to blue light and developed blue-green .(for example with dimethyl-para-phenylene-diamine and trichloronaphthol). In further baths the llter layers are -now removed, for instance by means of a solution of sodium hydrosuliite or Rongalite (Schultz Farbstofitabellen, 7th edition, Vol. II, pages 295 and 296), and the silver pictures in 1 and 5 are dissolved in knownmanner. The middle layer 3, which still consists of silver halide,

may now be colored by any desired mordanting process, for instance, by means of Pyronine G (Schultz Farbstofftabellen, 7th edition, Vol. I, f No. 853), or toning process, for instance, by conversion into a picture being formed by nickell dimethylglyoxime, or developed, after exposure,

by a developer which yields -a red picture (for example thioindoxyl) After xation or separe.-V tion of the silver produced in the lmiddle layer, the film contains three superimposed color-pictures which together give a complementary colored negative. From this any numbjer of correctly colored positives maybe made by the same procedure. Instead of a color forming developer there may also be used a developer containing a color forming component. The foregoing example deals only withl one of the possible methods of applying the invention. The arrangement of the layers may, for example, be otherwise selected; for, instance, one layer may be arranged on the back of the iilm. In this case the removal of the iilter. mayiollow the nishing of the iirst part-color picture if the production of the second andthethird picture (rear side) picture is such 'that only one side of 45 the iilm comes into contact with the baths.

What we claim is:

1. A photographic material which comprises a support,` aphotographic silver halide emulsion layerv applied to said support, a lter layer consilver halide emulsion layer'applied to said red- 55 filter layer, a yellow filter layer dyed with Fullers yellow made insoluble by calciumy nitrate applied.: to said silver halide emulsion layer and athird silver halide emulsion layer applied to said yellow lter layer, thev dyes of said red lter'layer and said yellow `filter layer being stable against treatmeut in the photographic treating bathsand being decolorizable by one of the group consisting of sodium hydrosulte and Rongalite.

2. A photographic material which comprises a support, a `red-sensitive silver halide emulsion layer applied to said support, a lter layer containing as areddyethe aluminium lake ofthe-p dyestui! from dlaaotized naphthylamine and 2- hydroxynaphtha1ene3.6disulfonic acid applied to said silver halide emulsion layer, a green-sensitive silver halide emulsion layer applied to said v 'red filter layer, a yellow filter layer dyed with Fullers yellow made insoluble by calcium nitrate 5 applied to said silver halide emulsion layer and a blue-sensitive silver halide emulsion layer applied lto said yellow lter layer, the dyes of said red iilter layer and said yellow illter layer being stable against treatment in the photographic treating baths and being decolorizable by one of the group consisting of sodium hydrosulte and Rongalite.

JOHN EGGERT. BRUNO WENDT. 

